Synthesis and Nonlinear Properties of Poly[1,4-bis(4-methylpyridinium)butadiyne triflate)]

Abstract

1,4-Bis(4-methylpyridinium)butadiyne triflate (1), which was prepared from the reaction of 1,4-bis(4-pyridyl)butadiyne with methyl trifluoromethanesulfonate, was found to be piled up along the c axis with two triflates as counter anions. The UV irradiation and thermal treatment of 1 gave rise to 1,4-topochemical polymerization to yield poly[1,4-bis(4-methylpyridinium) butadiyne triflate)]. The third-order nonlinear optical susceptibility (χ(3)) of the polymer was determined by the degenerate four wave mixing (DFWM) method to exhibit the remarkable high value of 2.2×10–10 esu.